Grinding pan



March 6, 1928. 1,661,297

w. E. MOMURRAY GRINDING PAN 2 Sheets-lime! 1 Filed April l4, 192? w v N INVENTOR 1,661,297 w-. E. MCMURRAIY 4 GRINDING PAN v Filed A ril 14, 192? 2 Sheets-Sheet- 2 \M QwW A NM \N March '6, 1928.

INVENTOR. IVAL 75/? E. M MaR/PAY B ORNEYS.

WALTER EARL IOIUBBAY, OF

- 1 :1 ,rmsrnvmra, manor. roman.-

rmmvmm. I

ems ran.

' Application and A r l 14,1927. Serial no. mam.

This "invention -relates to grinding pans and has for its object to provide an improved construction and arrangement of parts 1n amachine of this character with a view to.

I facilitating the assembly, repair and replacement of said parts; to adapt said parts to .po

(1 mitted .by hollow'shaft 14 to bevel pinion-13 and thenceby perform their functions -in an improve manner; to provlde a machine which will be durable under service requirements and which can be operated more economically.

Toward the attainment of this purpose,

my invention contemplates certainspecific objects of invention which will appear in specification andbe pointed out in=the appended claims, reference beinghad to the acinvention 1n a preferred embodiment. In the drawings:

Figure 1 is an irregular horizontal section of the machine, parts being broken away and parts shown in plan.

Figure 2 is an irregular vertical section corresponding to thehne 22, of- Figure'l. In t e embodiment of my. invention shown in the drawings, a foundation 1 is suitably formed to provide a central pit 2, 'an annular shelf 3 extending around thepit 2, the

u per surface 4 of-said foundation being suita lyarranged to receive the space up- 80 right-frames5. Asshown in Figure 1, the

. frames 5 are symmetrically disposed with respect to a common vertical. plane and are united above by-across-piece or upper framework 6. i Seated within'the central pit 2 of the foundation, is a pedestal 7 for the support of a step bearing 8 within which is p seated the lower end of a vertical rotary shaft 9, said shaft, as shown .in Figure 1, having its axis-disposed within the plane of symmetry of end frames 5, 5., The up r end of shaft 9 is journalled-in a suita l'e bearing 10 within the cross-piece 6.- With-- in a sultable'housing 11 which'surmounts the cross-piece 6 is a large bevel gear 12 which is.

keyed to the upper end of shaft 9 and is driven by a bevel pinion 13. shownon the drawings, the bevel pinion 13is integr 11 formed with a hollow shaft 14 to whic is keyed a spur gear v15.. The hollow is iournalled upon a radial stationcompanying drawings which exemplify my the p ane of s ,in vertical transverse planes ary shaft 16 which is supported atits inner end within 'a bearing. lug 117 and at its outer end is carriedby a bearing lug 18. It will be understood from this description that wer dehvered to the spur gear 15 is. translarge bevel gear 12 tojthe rotag'shaft 9.. urmounting the step bearing 8 isa sleeve or collar 19 which'serve's "to support-the hub 00 portion 20 of a revolvin' pan, said pan be-' ing thus supported in ependently of the. rotary shaft 9' in such a way as to permit said shaft to be removed without disturbing the revolvable'pan. .A key 21 connects the hub 20. to the rotary shaft 9 forthe purpose of rotating the pan, Y

As shown .on the drawings, the spaced end frames or uprights 5, 5 are provided with inclined webs 22 to the inner surfaces of which are secured the base flanges 23-of laterally spaced bearings 24, said bearings be-. ing s etrically disposed with res ect to etry of said end ames. Mounted within the bearings 24' are oppositely dis sed stationary shafts 25 upon the outer en s. of which are oscillatably mounted the laterally spaced bearings 26 of two oppositely arranged trian lar roll-support in arms 27 the inner en 28 of sai arms being contracted and arranged on opposite sides of the rotary shaft 9 as shown best in Figure 1. Presented 'la-terall in opposite directions from these inner en s are sultable ins or shafts 29 upon which are journalled the rolls 30. By an inspection of'F-igure 1, it will be seen that the axes of the pms 29, 29 as well as of the rolls 30, 30, are arranged arallel to the axisof rotary shaft. 9, but 0 set therefrom. By means of this construction and arra ment of parts, the line of runnin contact tween each. ofthe rolls 30 an the rotary pan, is angularly disposed with respect to the direction of movement of the pan surface passing said line. I 7

Referring now to, Figure 1, on each of the end frames 5 are mounted laterally spaced box-supports 31 which carry a transverse rod 32. Presented inwardly from the oppositely disposed rods 32 are suitable clamping-brackets 33 for depending crank-arm supports 34 which adjustably supportv the scraper plates 35. As would appear from an inspection of Figure 2, the rod 32 and box-supports 33 construction .will now be readily understood V rigid mounting of the vertical drive shaft.1

and briefly recited are as follows: 7

As compared to that type of machine in which the rolls are made to revolve about the axis of a rotating shaft which drives them, as well as in con'iparison to that type of machine in which the rolls are journalled in fixed planes below the cross-piece of the main frame, the height of frame may be made less where the rolls are mounted to rotate in fixed vertical planes at the sides of the cross-piece. Furthermore, this construction provides for 'a more rigid support for the scrapers and calls for a shorter and more An absence of parts on the outer sides of the rolls also renders the screen platesmore accessible and facilitates the replacement of tires. and other repairs.

- By the provision of only a single support for each roll-journalling pin and the arrangement of said pin to project outwardly therefrom also conduces to conveniencein removing and replacing tires and furthermore exposes the roller bearings to dirt at only one point.

For neutralizing the tendency toward an outward displacement of the rolls from their pins or journals,the present construction provides for an an ular displacement of the lineof contact with the pan in which it runs with respect to the path of said pan as it approaches said line and at the same time applies the gyroscopic effects of the rotating ,roll in the plane of its vertical) movement. As a result therefore, there is a reduction of wear of the roll bearings as well as a lessening of strain in the roll-sup porting arm. In this connection may be mentioned the roughly triangular form of each roll-supporting arm in virtue of which.

an elongated bearing axis is provided for the'relatively larger pivotally-supported end of said arm while the relatively smaller roll-carrying end is offset to one side of the sented outwardly therefrom. By providing a separate support for the vertical shaft with the journalling pin prerotary pan by means of a spacing collar inotally-mounted on para] terposed between it and within which the vertical shaft is mounte said-shaft is relieved from the weight wof said pan while at the same time it is. ada ted to e readily removed without dismantling the machine. I

I claim: 1. In a machine of the combination with a pan rotatable about a vertical axis, of roll-supporting arms pivel axes transverse to a common plane including said vertical axis and having inwardly-presented contracted ends arranged on o posite'sides of said plane, the pivotal bearlngs for each of said. roll-supporting arms comprising bearing portions arranged on o posite sides of said plane, journal pins pro ecting laterally from the contracted inner ends of said rollsupporting arms and presented away from said plane, and rolls journaled on said pins and running in said pan.

2. In a machine of the character described, the combination with oppositely-presented upright frames transversely arranged and the character described,

centrally disposed with respect to a common vertical plane, of a pan rotatable about a vertical axis lying within said plane and between said frames, substantially triangular roll-supporting arms having correspondin sides pivotally mounted on parallel axes an with the inwardly-presented apex-ends of said arms arranged on opposite sides of the vertical axis of said pan, the pivotal bearing of each of said triangular arms extending on .shaft, substantially triangular roll-supporting arms havin oppositely presented sides pivoted on para lel axes transverse to a plane includin the axis of said power shaft andhaving t eir contracted apex ends arranged on opposite sides of said plane with said power driven shaft interposed between the inner lateral faces of said contracted apex ends, and rolls journaled in the contracted apex ends of said triangular arms and running in said pan.

4. In a machine of the character described, the combination with oppositelydispdsed upright frames, each of said frames being symmetrically arranged with respect to a common vertical plane, roll-supporting arms comprising substantially triangular frames, each of said roll supporting frames havin axially-spaced bearings arranged on contracted outer end-offset with respect to said plane, rolls journaled in said-contracted outer ends of said frames, and a rotary pan within which said rolls operate.

opposite sides of said common plane and a 5. In a machine of the character described, the combination with a grinding pan rotatable about a vertical axis, of oppositely disposed end frames, each of said end frames being symmetrically arranged with respect to a common plane including said axis, a roll-supporting arm pivotally mounted in each 'of said end-frames on, an axis transverse to said plane, said roll-supporting arm being provided" with axially-separated bearings arranged on opposite sides of said plane and with a contracted inner end offset to one side of said vertical axis and rollsjournaled in said contracted inner ends of the roll-supporting arms.

6. In a. machine of the character described, the combination with a verticallydisposed rotary shaft, of a grindin pan rotatable about the axis of said sha spaced end-frames transversely disposed with respect to a common plane of symmetry which includes the axis ofsaid shaft, a cross-piece arranged longitudinally and centrally with respect to said plane to connect said end-frames, said cross-piece being provided with a bearing for said shaft, rollsupporting arms oscillatable in said endframes on axes transverse to said plane, and rolls journaled in said arms and having their inner lateral faces arranged parallel to and laterally displaced from the vertical planes through the lateral edges of said cross-piece.

- 7. In a machine of the character described, the combination with a main frame, of a rotary shaft journaled on avertical axis within said frame, a pan revolving with said shaft, vibratory arms having their outer ends pivotally mounted on parallel axes extending transversely to a plane including the vertical axis of said rotary shaft and their inner ends on o posite sides of said plane, and rolls rotat-aiily mounted in the inner ends of said vibratory arms on axes parallel to the pivotal axes of said vibratory arms and respectively nearer to their corresponding pivotal axes than -the vertical axis of said rotary shaft.

8. In a machine of the character described, the combination with a main frame, of a rotary shaft journaled on a vertical axis within said frame, apan revolving with said shaft, oppositely-presented vibratory arms respectively having laterally-spaced pivotal hearings in said frame, the spaced pi'votal bearings of each of said vibratory arms being arranged on opposite sides of a common vertical plane includin the axis of said shaft, each of said arms eing provided with a contracted free end laterallydisplaced from said plane and on the oppo- .site side thereof with respect to the contracted free end of the other vibratory arm,

oppositely and outwardly presented roll journaling pins mounted in the free ends of said vibratory arms, and rolls journaled on said pins.

9. In a machine of the character described, the combination with spaced upright frames, of a rotary shaft journalled on a vertical axis between said upright frames, said upright frames being symmetrically disposed with respect to a plane ineluding said axis, a rotary pan coaxial with and driven by said shaft, roll-supporting arms provided with bifurcated bearings at their outer ends in saidupright frames and having their free ends arranged on opposite sides-of said rotary shaft, roll-sup orting shafts mounted in the inner en s 0 said arms and presented away from said axis, and rolls journalled on said shafts, the axes of said rolls being nearer to the pivotal axes of their respective supporting arms.

10. In a machine of the character de-- scribed, the combination with spaced upright frames, ofa rotary shaft journalled on a vertical axis, a rotary pan coaxial with and driven by said shaft, roll-supporting arms pivotally-mounted at their outer ends in said upright frames and having their respective free ends ofl'set on opposite sides of said rotary shaft, roll-supporting pins mounted in the inner ends of said arms and presented away from said shaft, rolls journailed on said pins, and a cross-piece extending across the tops of said u right frames between the inner faces 0 said rolls.

11. In a machine of the character described, the combination with spaced upright frames, of a rotary shaft journalled on a vertical axis between said frame, a rotary pan coaxial with and driven by said shaft, roll-supporting arms pivotallymounted at their outer ends in said upright frames and having their inner free ends arranged on opposite sides of said shaft, pins supported at one end in said inner free ends of said roll-supporting arms, said pins be ing presented outwardly away from said shaft, rolls journalled on said pins, and a cross-piece extending between the innerfaces of sald rolls and connectmg'the up-' f-ao ner sides of said rolls in planes beyond the outer limits of said cross-piece. i

13. 'In a machine of the character described, the combination with a vertical 1'0- tary shaft. of bearings for said shaft, a pan rotated by said shaft, roll-supporting arms mounted on fixed horizontal axes distant from said shaft, said arms being provided with contracted inner ends arranged on opposite sides of said shaft, roll-journalling pins presented outwardly from the inner ends of said arms, and rolls journalled on said pins. 1

WALTER EARL MUMURRAY'. 

